8		3				2	5
	4
		7		4	8
		8	1		2
						8
3	5				7		6

Difficulty: Very easy (0)

4
				1			2
2				5	1	6
	1			2			8
7			4			1
	8	5	6				4
6			1
							1

Difficulty: Easy (0)

1				6
5				2	6	8	7
							5
6
8	7	1	2				3
			6				2

Difficulty: Hard (0)

3			5
		7
			7		4		8
5			4			6
	1			5			4
2		5		1
					3
				4			2

Difficulty: Very easy (0)